The Chinese Earthquake Networks Center said the temblor hit Yutian County in Xinjiang province's Uyghur Autonomous Region, China's official Xinhua news agency reported.
Its epicenter was at a depth of 6.8 miles.
The quake was felt over 2,000 square miles and affected about 700 people, said the Ministry of Civil Affairs.
Only a few houses may have been damaged or destroyed, the earthquake center said.
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